The Coronal Diagnostic Spectrometer aboard the Solar and
Heliospheric Observatory observes the solar EUV spectrum in
two bands between 308--379~{Å} and 513--633~{Å}. The
full Sun irradiance can be measured by rastering the
instrument over the solar disk. Measurements of the solar
irradiance have been made starting 25~March 1997 and
continuing to the present, ranging from very quiet to very
active Sun. These measurements are the only current EUV
spectral irradiance measurements taken on a regular basis.
As well as irradiance values, the most recent observations
also provide moderate resolution solar images to help
quantify the important sources of the irradiance
variability. The dependence of individual spectral lines on
the solar cycle is presented, spanning the temperature range
from 3 \times 104~K to 2.7 \times 106~K. The
important spectral lines of He~II and Si~XI at 304~{Å} are
observed in second order and separated. The high spectral
resolution of these measurements, combined with the coverage
of a significant proportion of the solar cycle, provide a
unique dataset for understanding solar variability in the
EUV. In addition, these data are important input for
interpreting data from broadband and lower resolution
irradiance monitors, such as the SOHO SEM and TIMED.